<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加角色按钮区域 -->
      <el-row>
        <el-row>
          <el-button type="primary">添加角色</el-button>
        </el-row>
      </el-row>
      <!-- 角色列表区域 -->
      <el-table
        :data="rolelist"
        border
        stripe
      >
        <!-- 展开列 -->
        <el-table-column
          label="<"
          type="expand"
        >
          <template slot-scope="scope">

            <el-row
              v-for="(item, index) in scope.row.children"
              :key="index"
              :class="['bdbottom',index === 0 ?'bdtop':'','vcenter']"
            >
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag
                  closable
                  @close="removeRightById(scope.row,item.id)"
                >{{item.authName}}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级和三级权限 -->
              <el-col :span="19">
                <!-- 通过 for 循环 嵌套渲染二级权限 -->
                <el-row
                  v-for="(item1, index1) in item.children"
                  :key="index1"
                  :class="[index1 ===0?'':'bdtop','vcenter']"
                >
                  <el-col :span="6">
                    <el-tag
                      type="success"
                      closable
                      @close="removeRightById(scope.row,item1.id)"
                    >{{item1.authName}}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag
                      type="warning"
                      v-for="(item2, index2) in item1.children"
                      :key="index2"
                      closable
                      @close="removeRightById(scope.row,item2.id)"
                    >
                      {{item2.authName}}
                    </el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>

          </template>
        </el-table-column>
        <el-table-column
          label="#"
          type="index"
        ></el-table-column>
        <el-table-column
          label="角色名称"
          prop="roleName"
        ></el-table-column>
        <el-table-column
          label="角色描述"
          prop="roleDesc"
        ></el-table-column>
        <el-table-column
          label="操作"
          width="300px"
        >
          <template slot-scope="scope">
            <el-button
              type="primary"
              icon="el-icon-edit"
              size="mini"
            >编辑</el-button>
            <el-button
              type="danger"
              icon="el-icon-delete"
              size="mini"
            >删除</el-button>
            <el-button
              type="warning"
              icon="el-icon-setting"
              size="mini"
              @click="showSetRightDialog(scope.row)"
            >分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>

    </el-card>

    <!-- 分配权限对话框 -->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%"
      @close="setRightDialogClosed()"
    >
      <!-- 树形控件 -->
      <el-tree
        :data="rightsList"
        :props="treeProps"
        show-checkbox
        node-key="id"
        default-expand-all
        :default-checked-keys="defKeys"
        ref="treeRef"
      ></el-tree>
      <span
        slot="footer"
        class="dialog-footer"
      >
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button
          type="primary"
          @click="allotRights()"
        >确 定</el-button>
      </span>
    </el-dialog>

  </div>
</template>

<script>
export default {
  data() {
    return {
      //所有角色列表数据
      rolelist: [],
      //控制分配权限对话框
      setRightDialogVisible: false,
      //所有权限树数据
      rightsList: [],
      //树形控件的属性绑定事项
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      //默认选中的节点ID值
      defKeys: [],
      //当前即将分配权限的角色ID
      roleId: ''
    }
  },
  created() {
    this.getRolesList()
  },
  methods: {
    //获取所有角色列表
    async getRolesList() {
      const { data: res } = await this.$http.get('roles')

      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败')
      }

      this.rolelist = res.data

      this.$message.success('获取角色列表成功')
    },
    //根据ID删除对应的权限
    async removeRightById(role, rightId) {
      //弹框提示用户是否删除
      const confirmResult = await this.$confirm(
        '此操作将永久删除该条记录, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)

      if (confirmResult !== 'confirm') {
        //不想删除
        return this.$message.info('取消了删除')
      }
      //
      const { data: res } = await this.$http.delete(
        `roles/${role.id}/rights/${rightId}`
      )

      if (res.meta.status !== 200) {
        return this.$message.error('删除角色权限失败')
      }

      role.children = res.data

      //this.getRolesList()
      this.$message.success('删除角色权限成功')
    },
    //展示分配权限的对话框
    async showSetRightDialog(role) {
      this.roleId = role.id
      //获取所有权限数据
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取权限列表失败')
      }
      //把获取到的权限数据保存到data中
      this.rightsList = res.data
      this.$message.success('获取权限列表成功')

      //递归获取三级节点的ID
      this.getLeafKefs(role, this.defKeys)

      this.setRightDialogVisible = true
    },
    //通过递归的形式，获取角色下所有三级权限的ID，并保存到defKeys 数组中
    getLeafKefs(node, arr) {
      //如果当前node节点不包含children属性，则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      }

      node.children.forEach(item => {
        this.getLeafKefs(item, arr)
      })
    },
    //清空对话框
    setRightDialogClosed() {
      this.defKeys = []
    },
    //点击为角色分配权限
    async allotRights() {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]

      const idStr = keys.join(',')

      const { data: res } = await this.$http.post(
        `roles/${this.roleId}/rights`,
        { rids: idStr }
      )

      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败')
      }

      this.$message.success('分配权限成功')
      this.getRolesList()
      this.setRightDialogVisible = false
    }
  }
}
</script>

<style lang="less" scoped>
.el-tag {
  margin: 7px;
}

.bdtop {
  border-top: 1px solid #eeeeee;
}

.bdbottom {
  border-bottom: 1px solid #eeeeee;
}

.vcenter {
  display: flex;
  align-items: center;
}
</style>